Fennia Office Building, Helsinki
Project Information:
Type: Office, detailed studies
Consultant: EQUA
Client:Are Oy
Summary: Retrofit of office building with high U-values (thermal resistance). Ceiling heating/cooling panels, integrated to Sensus-system, were carefully dimensioned and positioned, resulting in improved comfort and 25-35% energy savings compared to the tradition system.
Challenge
The aim of the study was to use radiant ceiling heating/cooling panels in a renovation project with relative high window and envelope construction U-values. The ceiling panels were integrated to the Sensus-system, which is developed by Are - one of the largest HVAC (Heating, Ventilation and Cooling) contractors in Finland. The system suitability and possible energy savings were explored to calculate effective results.
In the Sensus-system the internal heat gains from the water based cooling panel network are used in AHU (Air Handling Unit) supply air heating with simultaneous free cooling effect to zones.
The system is controlled with developed special automation system with several control circuits and valves.
The challenge was to attain comfort summer and winter time indoor conditions with none replaced windows (U=2.0 W/m2K, g-value 0.62), and fair and reliable energy use comparisons between the traditional system and Sensus.
Read more information about Sensus system
Solution
Energy savings were achieved mainly by the following improvements compared to the traditional system:
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Result
Compared to traditional system Sensus system provided:
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